actionscript primitive data binary format is same as java primitive data binary format

write primitive data type to stream in actionscript and in java

data type	methods in ByteArray and FileStream(air)	methods in DataOutputStream in java
boolean	writeBoolean(val:Boolean)	writeBoolean(boolean val)
byte	writeByte(val:Byte)	writeByte(byte val)
short	writeShort(val:int)	writeByte(short val)
int	writeInt(val:int)	writeByte(int val)
float	writeFloat(val:Number)	writeFloat(float val)
double	writeDouble(val:Number)	writeDouble(double val)
string	writeUTF(val:String)	writeUTF(String val)

read primitive data type from stream in actionscript and in java

data type	methods in ByteArray and FileStream(air)	methods in DataInputStream in java
boolean	var val:Boolean=readBoolean()	boolean val=readBoolean()
byte	var val:Byte=readByte()	byte val=readByte()
short	var val:int=readShort()	short val=readByte()
int	var val:int=readInt()	int val=writeByte()
float	var val:Number=readFloat()	float val=readFloat()
double	var val:Number=readDouble()	double val=readDouble()
string	var str1:String=readUTF()	String str1=readUTF()

write actionscript primitive data type for java, read java primitive data as actionscript primitive

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"  layout="absolute" width="343" height="198">
	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import p1.Rect;
			import mx.utils.ObjectUtil;
			
			private function onWrite():void {
				
				
				var f:File=new File("C:\\tmp\\ActionscriptOut.dat");
				var out:FileStream=new FileStream();
				out.open(f,FileMode.WRITE);
				out.writeBoolean(true);
				out.writeByte(10);
				out.writeShort(100);
				out.writeInt(1000);
				out.writeFloat(10000.123456789);
				out.writeDouble(100000.123456789);
				
				out.writeUTF("Hello");
				out.writeUTF("World");
				
				out.close();
				
			}
			
			public function readAll():void {
				var f:File=new File("C:\\tmp\\JavaOut.dat");
				var fin:FileStream=new FileStream();
				fin.open(f,FileMode.READ)
				
				var boolVal:Boolean=fin.readBoolean();
				trace("boolean: "+boolVal);
				
				var byteVal:int=fin.readByte();
				trace("byte: "+byteVal);
				
				var shortVal:int=fin.readShort();
				trace("short: "+shortVal);
				
				var intVal:int=fin.readInt();
				trace("int: "+intVal);
				
				var floatVal:Number=fin.readFloat();
				trace("float: "+floatVal);
				
				var doubleVal:Number=fin.readDouble();
				trace("double: "+doubleVal);
				
				var stringVal:String=fin.readUTF();
				trace("string: "+stringVal);
				
				var string2Val:String=fin.readUTF();
				trace("string2: "+string2Val);
				
				fin.close();
			}
			

		]]>
	</mx:Script>
	<mx:Button label="Write" click="onWrite()"  x="21" y="41"/>
	<mx:Button x="116" y="41" label="Read" click="readAll()"/>
</mx:WindowedApplication>

write java primitive data type for actionscript to consume, v.s. read actionscript primitive data in java

package io;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class JavaPrimitiveData {


	public static void main(String[] args) throws Exception{
		
		writeData("/tmp/JavaOut.dat");
		readData("/tmp/ActionscriptOut.dat");
	}
	
	public static void writeData(String filename) throws Exception {
		DataOutputStream out=new DataOutputStream(new FileOutputStream(filename));
		out.writeBoolean(true);
		out.writeByte(10);
		out.writeShort(100);
		out.writeInt(1000);
		out.writeFloat(10000.123456789F);
		out.writeDouble(100000.123456789);
		out.writeUTF("Hello");
		out.writeUTF("World");
		out.close();
	}
	
	public static void readData(String filename) throws Exception {
		DataInputStream in=new DataInputStream(new FileInputStream(filename));
		boolean b=in.readBoolean();
		trace("boolean: "+b);
		
		byte byteVal=in.readByte();
		trace("byte: "+byteVal);
		
		short shortVal=in.readShort();
		trace("short: "+shortVal);
		
		int intVal=in.readInt();
		trace("int: "+intVal);
		
		float floatVal=in.readFloat();
		trace("float: "+floatVal);
		
		double doubleVal=in.readDouble();
		trace("double: "+doubleVal);
		
		String string1=in.readUTF();
		trace("string: "+string1);
		
		String string2=in.readUTF();
		trace("string: "+string2);
		in.close();
	}
	
	public static void trace(String msg) {
		System.out.println(msg);
	}

}

see /flex/data/postbinary for post data primitve data binary from flex application. An example that how a servlet can save raw post data.

see /flex/data/receive_binary for receiving binary data that could be created by java program